| http://www.w3.org/ns/prov#value | - including just about everything except Amazon's Kindle, but Kindle books can be read on an iPhone while Adobe's system is limited to dedicated eReaders and desktop computers.The ePub format is an open standard, albeit one managed by Adobe, so anyone can create a client application (an open-source one for Windows Phones was launched last week) but those only work for DRM-free texts - protected cont
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